(a) What is the best coefficient of performance for a refrigerator that cools an environment at – 3 0.0 ° C and has heat transfer to another environment at 45 .0 ° C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 × 10 6 J (a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at – 3 0.0 ° C and has heat transfer to another environment at 45 .0 ° C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 × 10 6 J (a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at
–
3
0.0
°
C
and has heat transfer to another environment at
45
.0
°
C
? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per
3.60
×
10
6
J
(a kilowatt−hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at −30.0ºC and has heat transfer to another environment at 45.0ºC ? (b) How much work in joules must be done for a heat transfer of 4186kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60×106 J (a kilowatthour)?(d) How many kJ of heat transfer occurs into the warm environment?(e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at -30.0C and has heat transfer to another environment at 45.0C? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60 X 106 J (a kilowatt-hour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28
C and has heat transfer to another environment at 49 ° C?
COP,
= 3.18
ref
(b) How much work must be done for a heat transfer of 4186 kJ from the cold environment?
W = 1316.4
kJ
(c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)?
Cost in cents = 3.66
(d) How many kJ of heat transfer, Q, occurs into the warm environment?
Qn
= 1314.5
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The Second Law of Thermodynamics: Heat Flow, Entropy, and Microstates; Author: Professor Dave Explains;https://www.youtube.com/watch?v=MrwW4w2nAMc;License: Standard YouTube License, CC-BY